Drill-chuck.



PATENTED APR. 14, 1903.

J. J. MODONOUG'H.

DRILL CHUUK.

APPLICATION FILED JULY 17, 1902.

110 MODEL.

UNITE Smarts JOHN J. MCDONOUGH, OF SCI-IENECTADY, NEW YORK.

DRILL-CHUCK.

SPECIFICATION forming part of Letters Patent No. 725,273, dated April 14, 1903:.

Application filed .l'uly 17, 1902. Serial No. 115,964. (No model.)

To all whom it may concern.-

Be it known that I, JOHN J. MODONOUGH, a citizen of the United States, residing at Schenectady,in the county of Schenectady and State of New York, have invented certain new and useful Improvements in Drill-Chucks; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in drill-chucks.

The object of the invention is to provide a drill-chuck which is simple of construction, efficient in use, and comparatively inexpensive of production and which possesses'maximum strength with ease of adjustment of the aws.

With the above and other objects in View, which will readily appear as the nature of the invention is better understood, said invention consists in certain novel features of construction and combination and arrangement of parts, which will be hereinafter fully described and claimed, and illustrated in the accompanying drawings, in which Figure l is a front elevation of the chuck, part of the body being broken away to more clearly show one of the adj Listing-screws. Fig. 2 is an end elevation. Fig. 3 is a top plan view. Fig. 4is a horizontal section. Fig. 5 is a vertical section taken substantially on line 5 5 of Fig. 1.

Referring now more particularly to the drawings, 1 denotes the body of the chuck, comprising a head 2, converging sides 3 3, extending from the head, and a skeleton cross-bar 4, uniting said sides at their outer ends, forming a skeleton frame to receive the jaws The jaws 5 5 are of the fingered typet'. 6., provided on their meeting faces with interengaging beveled projections 6 6, slidable upon each other and holding the jaws against independent longitudinal play, while allowing them to move toward and from one another to grip and release a tool. The jaws are adapted to slide in the opening of the skeleton cross-bar 4 and when the chuck is new are adapted to be brought into operative position with a limited range of outward movement; but when the jaws and side of the chuck-body become Worn the outgaging threaded recesses in the jaws.

ward movement or adjustment of the jaws must necessarily be increased in order to thereby. By this means it will be seen that by simply adjusting the wear-strips any tendency of the jaws tohave independent play or rocking movement may be counteracted and all slack taken up, so that the jaws may be moved into and out of operative relation with a minimum degree of movement.

Journaled in the head are screw-shafts 8 S, occupying recesses in the sides 3 3 and en- These shafts are provided at their outer ends with worm-gears 9 9', engaging worm-threads on an operating-shaft 10, having a squared end 11 to receive a wrench or crank by which it may be turned. On turning the shaft 10 in one direction or the other the jaws are adjusted in an obvious manner in the skeleton frame. By thus constructing the operating mechanism the jaws may be easily adjusted andhavea strong gripping action, and the chuck is made compact, strong, and durable.

From the foregoing description, taken in connection withthe accompanying drawings, it is thought that the construction, mode of operation, and advantages of my improved drill-chuck will be readily apparent without requiring a more extended explanation.

Various changes in the form, proportion, and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of this invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A chuck comprising a skeleton frame having inclined sides, jaws sliding in the frame and having correspondingly-inclined grooved edges, Wear-strips engaging said grooved edges, means for adjusting said wear-strips, and means for operating the jaws, substantially as specified.

2. A chuck comprising a skeleton frame having inclined sides, jaws sliding in the frame and having correspondingly-incllned grooved edges, wear-strips engaging said grooved edges, means for adjusting said to wear-strips, screw-shafts engaging threaded surfaces on the jaws, and means for simulta= neously operating said shafts, substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in presence of two subscribing wit- I5 nesses.

JOHN J. MCDONOUGH. Witnesses:

RHODY TOHER, WILLIAM E. MATTHEWS. 

